Fuel Type - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 22 Old 09-26-2014, 11:42 PM Thread Starter
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Fuel Type

What gas octane are you running? High Test? Mid Grade? or 87 octane / plain old regular?

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post #2 of 22 Old 09-27-2014, 12:35 AM
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I use regular, 87 octane as that is what is specified in the manuals. I also pour <an ounce of Marvels Mistery Oil in every fillup for more top end lubrication.
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post #3 of 22 Old 09-27-2014, 07:37 AM
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85 for me we are at 4700 feet asl.
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post #4 of 22 Old 09-27-2014, 11:19 AM
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What gas octane are you running? High Test? Mid Grade? or 87 octane / plain old regular?

Thanks
Joe


The engine is designed for 87 octane and there isn't any real reason to run a higher grade. Octane rating only addresses potential pre-detonation (engine knock) and not performance so why run a higher grade?


With that said I actually run 89 octane to provide slightly more pre-detonation protection because pre-detonation causes severe harm to an engine. There are a lot of steep grades where I live and pre-detonation occurs when the engine is under heavy load like when climbing a steep grade. "An ounce of (extra) prevention" only costs me a few cents per fill-up. Admittedly I'm probably stupid to be using a higher octane rating gasoline.




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post #5 of 22 Old 09-27-2014, 11:31 AM
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I use regular, 87 octane as that is what is specified in the manuals. I also pour <an ounce of Marvels Mistery Oil in every fillup for more top end lubrication.
Spock


Some people swear by Marvel Mystery Oil and I used it when I owned my 1928 Oldsmobile but I don't believe it's necessary for modern engines. There really isn't anything to lubricate (i.e. the valve guides are lubricated from the engine oil).


My biggest concern would be that it might result in clogged fuel injector ports over time as it's denser than gasoline and could build up in the port. I don't know of that actually happening but do know that using a fuel injector cleaner once in awhile is a good idea.


But some people love it and if they want to use it then it's their engine and they are certainly welcome to do so.



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post #6 of 22 Old 09-27-2014, 06:24 PM
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It's like how some people swear by using sea foam, but it's not all that necessary. Using it on an older engine might help a bit and make you feel better about it in the process.
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post #7 of 22 Old 09-27-2014, 11:09 PM
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Modern engines, as already stated earlier by other members do not require additional lubrication. By adding oil to the fuel will only lead to clogged injectors, sticky valves, extra deposition of carbon on the cylinder head and even carbon and maybe sludge in the exhausts. All this is just not desirable. Best to run the machine as it is designed to be run. As they say, "Follow the Doctors orders".
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post #8 of 22 Old 09-28-2014, 10:39 PM
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My Stealership told me to use 93 octane only.... Maybe next fill up I will through 87 in there ti see if I get an "pings"
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post #9 of 22 Old 09-29-2014, 09:15 AM
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My Stealership told me to use 93 octane only.... Maybe next fill up I will through 87 in there ti see if I get an "pings"

For a street the dealership said 93?

Owners manual and service manual both indicated 87. And that is at sea level.
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post #10 of 22 Old 09-29-2014, 10:12 AM
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For a street the dealership said 93?

Owners manual and service manual both indicated 87. And that is at sea level.

With EFI and electronic ignitions I don't believe elevation is a consideration (except for lower performance due to lower atmospheric pressure). Modern engines with electronic ignitions and EFI are designed to change the timing slightly with elevation changes to eliminate pre-detonation. I'm not sure that this is programmed into the Street Harley's but it probably is. I've never had a problem with my Sportster at elevations and it is a simple programming requirement for the engine that doesn't cost the manufacturer anything.




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